1995 3.1 replace crank sensor

[tblake]

OBD1's diagnostics are not as good as OBD2, but it all depends on if its a hard fault. Also I don't think OBD1 has the capabilities to mointor missfires. However I do not know if that changed in 1995 with the split year.

Have you taken a look at your IAC motor on the throttle body to see if it is all carboned up? Maybe it is stuck open causing a high idle, and when the PCM tries to idle down, it runs lean and sputters.

You could also pull the ICM off and bring it in to maybe advance or autozone. Depending on what connectors yours needs, they maybe able to bench test it for you. If it checks out good, have them do it again to get it nice and cooking.

[rockien]

tblake, thanks for all the info. A buddy of mine has a friend that has a repair shop about a mile away, so we towed the car for him to take a look at. He said we did all the main stuff, but said he had a good diag tool that will test the different sensors and modules, so hopefully it won't be too bad. I didn't take the IAC out and look at it, but I think that is the next item to look at.
I'm just out of time and there dosn't seem to be enough time in the day. The back of my suburban is filled with a broken 502 with a hole in the piston, so I just need to get the car going.
I will post the findings of what he finds wrong with the 3.1 when it is fixed.

[rockien]

Just an update to the fix. Towed tthe car to a shop where it sat for 3-4 days. The mechanic started the car and it ran fine, so he took it for a drive and it ran fine.
Both Crank sensors were replaced, but it still had the problem when I towed it to the shop. Go figure! Maybe the ECM needed a few days off to reset.
Anyways I really appreciate everyones advice!

[tblake]

Or maybe its a problem with the ECM itself. Same thing happaned to me, car stalled, shop couldn't figure it out, but out of the blue it started. Drove it for a week and then it stalled out again. This time replacement of the ECM fixed the issue. Just be careful driving it on long trips for the time being.

[rockien]

That's a good piece of information tblake. If it happens again, I will have another thing to try. I won't be driving it anywhere far, anytime soon. A buddy of mine works at a salvage yard, so I should be able to get ECM from him if it happens again. With the deepfreeze we are all in for the next couple of days, I'm glad I don't have any travel plans.

[tblake]

Yeah, not a bad idea to stick close to home for the time being.

You could try a tap test on the ECM with the car at idle. See if it stalls out.

If you do end up swapping the ECM out, don't forget to open them up swap PROM chips. That is if the 95 model allows you to do this. It may be the new design...